Pa Wastewater Module 7 (Basics Of Chemical Feed Systems)

Front 1

List the chemicals you might add to wastewater to control odor. Include the chemical name and best feeding form for each.

Back 1

Ans:

[(KMnO4) Potassium Permanganate. Best feeding form: dry to form solution.

(H2O2)Hydrogen Peroxide. Best feeding form: liquid.

(FeSO4 · 7 H2O) Ferrous Sulfate (Odophos). Best feeding form: dry granular to form solution.]

Front 2

List several chemicals that might be added to wastewater to promote phosphorus removal. Include examples of both dry and liquid chemicals and identify the normal batch strength of the food solution.

Back 2

Ans:

(Al2(SO4)3 · 14 H2O ) Aluminum Sulfate (Alum). Batch strength: 0.5 lb/gal

(Al2(SO4)3 · X H2O )Aluminum Sulfate (Liquid Alum). Batch strength: Neat

(FeCl3) Ferric Chloride. Batch strength: Neat

(Fe2(SO4)3 · X H2O ) Ferric Sulfate. Batch strength: 5.5 lb/gal max.

(FeSO4 · 7 H2O) Ferrous Sulfate (Odophos). Batch strength: 0.5 lb/gal

Front 3

Synthetic organic polymers can be used to enhance the flocculation process in wastewater treatment plants.

a. _____ True b. ____ False

Back 3

Synthetic organic polymers can be used to enhance the flocculation process in wastewater treatment plants.

a. ___X__ True b. ____ False

Front 4

In a lime stabilization process, if the pH is allowed to fall below 9.0, ______activity could resume and create the potential for offensive odors.

Back 4

In a lime stabilization process, if the pH is allowed to fall below 9.0, biological activity could resume and create the potential for offensive odors.

Front 5

Which of the following chemicals are commonly used to supplement alkalinity in wastewater treatment processes? (Check all that apply.)

a. _____ Lime

b. _____ Sodium Hydroxide

c. _____ Sulfuric Acid

d. _____ Magnesium Hydroxide

e. _____ None of the above.

Back 5

Which of the following chemicals are commonly used to supplement alkalinity in wastewater treatment processes? (Check all that apply.)

a. ___X__ Lime

b. ___X__ Sodium Hydroxide

c. ____ Sulfuric Acid

d. __X_ Magnesium Hydroxide

e. ____ None of the above.

Front 6

MSDS stands for

Back 6

Material Safety Data Sheet

Front 7

List the five components of chemical handling equipment.

Back 7

Selection of equipment

Labels and warning signs

Breathing Protection

Protective Clothing

Protective Equipment

Front 8

A 1.0 MGD treatment facility uses 12.5 % sodium hypochlorite solution for disinfection. Laboratory testing has determined that the active chemical strength of the hypochlorite is 1.04 pounds of chlorine per gallon. The desired chemical feed rate is 2.5 mg/l.

Determine the required chemical feed pump setting assuming that the feed pump calibration curve is identical to the alum feed pump in the class problem.

Back 8

Solution:

Step 1 – Compute the required chemical feed rate (#/day).

Feed Rate (R) (#/day) = 1.0 (mgd) x 2.5 (mg/l) x (8.34 #/gal)

= 20.85 #/day

Step 2 – Compute the required solution feed rate in gal/day.

Solution feed (gal/day) = 20.85 #/day ÷ 1.04 #/gal

= 20.05 gal/day

Solution feed (gal/min) = 20.05 gal/day ÷ 1440 min/day

= 0.014 gal/min

Step 3 – Determine feed pump setting using the calibration curve from the class problem.

Alum Pump Calibration Curve0.0000.0200.0400.0600.0800.1000.1200.140020406080100Pump Setting (%)Chemical Feed Rate (gpm)

Ans: Chemical feed rate = 0.014 gal/min  Feed Pump Setting = 14%

Front 9

Match the common liquid feeders below with the range of feed rates needed.

Feeding Pump Feed Rate

A. Positive Displacement a. 0.1 to 10 gph

B. Solenoid Metering b. less than 0.1 gph

C. Peristaltic Pump c. 0.1 to 600 gph

D. Jet Pump d. Not defined in our workbook

Back 9

Match the common liquid feeders below with the range of feed rates needed.

Feeding Pump Feed Rate

A. c Positive Displacement a. 0.1 to 10 gph

B. a Solenoid Metering b. less than 0.1 gph

C. b Peristaltic Pump c. 0.1 to 600 gph

D. d Jet Pump d. Not defined in our workbook

Front 10

A multi-station Jar Test Stirrer lab equipment station usually has 4 to 6 beakers for simultaneous testing of various strengths of coagulant chemicals.

a. ____ True b. ____ False

Back 10

A multi-station Jar Test Stirrer lab equipment station usually has 4 to 6 beakers for simultaneous testing of various strengths of coagulant chemicals.

a. X True b. ____ False

Front 11

The two common types of gas feed equipment are _____feed and _____feed.

Back 11

The two common types of gas feed equipment are direct feed and solution feed.

Front 12

Chemical storage should be in the vicinity of feeders to avoid necessary handling.

Back 12

True

Front 13

All chemicals should be stored in spill containment areas.

Back 13

False (only liquids)

Front 14

Gaseous chemical storage is usually in an adjacent room or outside building at a location close to the feed room.

Back 14

True

Front 15

The minimum chemical amount of chemical storage is 30 days supply at average use.

Back 15

False (10 days supply)

Front 16

What type of Chemical Feed System is represented by the following schematic? Write your answer in the space provided.

Back 16

Typical Bulk Liquid Chemical Feed System

Front 17

List the two Feed Systems that require leak detection equipment.

Back 17

Liquid and Gaseous